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Science  18 Jun 2004:
Vol. 304, Issue 5678, pp. 1753-1754
DOI: 10.1126/science.1099898

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Neuroscientists are intrigued by the neural events that determine decision-making. In their Perspective, Daw and Dayan discuss new work ( Sugrue et al.) showing that the activity of monkey parietal cortex neurons correlates with an economic variable measuring the relative worth of two targets offering variable rewards in a matching task.